/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package com.google.code.biglo.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import com.google.code.biglo.utils.JpaQueryBuilder.JQBParam;

public class StringToConverterFabric {
	
	public static StringToConverter createConverter( String expression){
		if(isDataType(expression))
			return new StringToDateConverter();
		if(isBoolean(expression))
			return new StringToBooleanConverter();
		if(isInt(expression))
			return new StringToIntConverter();
		return  new StringToStringConverter();
		
	}

	private static boolean isInt(String expression) {
		try{
			Integer.parseInt(expression);
			return true;
		}
		catch (NumberFormatException e) {
			return false;
		}
		
	}

	private static boolean isBoolean(String expression) {
		String trueString=new String("true");
		String falseString=new String("false");
		if(trueString.equalsIgnoreCase(expression) || falseString.equalsIgnoreCase(expression) )
			return true;
		return false;
	}

	private static boolean isDataType(String expression) {
		Date date=null;
		try {
			SimpleDateFormat format = new SimpleDateFormat("dd-MM-yyyy HH:mm");
			date = format.parse(expression);
			if(date != null) return true;
		} catch (ParseException e) {
			return false;
			
		}
		return false;
	}
	
}
